Si4133 RF Synthesizer
DUAL-BAND RF FREQUENCY SYNTHESIZER
WITH INTEGRATED VCOs FOR WIRELESS
COMMUNICATIONS
FEATURES
• Dual-band RF Synthesizers:
RF1 900 MHz to 1.8 GHz
RF2 750 MHz to 1.5 GHz
• IF Synthesizer:
IF 62.5 MHz to 1.0 GHz
• High frequency “HF” devices available—
Supports frequency synthesis up to 2.4 GHz
• Dual Synthesizer and Single Synthesizer
derivatives available
• Fully integrated VCOs
• Programmable loop filters
• Minimal (2) passive external components
• Automatic selection of optimal phase
detector gain and modulus prescalar values
• Low phase noise
• Fast settling times (200 µS for
GSM/DCS1800 applications)
P R O D U C T
D E S C R I P T I O N
• 1 µA standby current @ 3V
The Si4133 is a monolithic integrated circuit that performs IF and dual-band, low-
• 18 mA supply current @ 3V
noise RF frequency synthesis for wireless personal communications applications.
• 2.7V to 3.6V operation
The Si4133 addresses the price-sensitive, low-power, high-performance requirements for personal wireless communications by substantially reducing external
passive component count, eliminating external VCOs and external varactor
APPLICATIONS
• Dual-band wireless communications
• Digital cellular telephones
diodes, improving power efficiency, and isolating, in silicon, unwanted external
• Dual-band ISM terminals:
interference. The stable, low-phase noise characteristics are achieved through a
Digital cordless phones
proprietary self-tuning architecture that does not require external adjustments or
Wireless consumer products
laser trimming for component-tolerance matching.
Wireless industrial applications
The Si4133 includes three voltage-controlled oscillators, loop filters, reference
and VCO dividers, and phase detectors. Variables for dividers, phase detector gain
• Wireless data communications
• SMR applications
settings, and power-down settings are programmable through a three-wire serial
interface (Data, Clock, and Enable) and a 22-bit internal shift register.
P R O D U C T B R I E F
The Si4133 comes standard in a low-profile, small-outline, 24-pin package (TSSOP).
MEETING THE CHALLENGES OF RF
Si4133 Enhanced Frequency Synthesizer Block Diagram
XIN
PDWNB
SCLK
SDATA
SENB
AUXOUT
RFLA
RFLB
RFLC
RFLD
IFLA
IFLB
Reference
Amplifier
Power Down
Control
Serial
Interface
22-bit Data
Register
RF1 Reference
Divider
RF1 Synthesizer
RF2 Reference
Divider
RF2 Synthesizer
IF Reference
Divider
IF Synthesizer
RF1 Phase Detector
and Loop Filter
RF1
VCO
DESIGN WITH INNOVATIVE ANALOG
RFOUT
NOW SUPPORTING FREQUENCY
RF1 N Divider
RF2 Phase Detector
and Loop Filter
SYNTHESIS UP TO 2.4 GHz.
RF2
VCO
RF2 N Divider
IF Phase Detector
and Loop Filter
IF N Divider
AND MIXED-SIGNAL SOLUTIONS.
IF
VCO
÷
1,2,4,8
IFOUT
S i 4 1 3 3
R F
S Y N T H E S I Z E R
REDUCTION IN POWER
DISSIPATION
The Si4133 uses a proprietary self-
75% Area Reduction / 33% Cost Savings
calibration architecture that not only
results in fast settling times, but also
significantly reduces power consumption
in the PLL. That, in combination with the
Si4133’s flexible power-down scheme,
provides the lowest overall power
Discrete
Components
VCO
Module
consumption in RF synthesizer applica-
Freq
Synth IC
tions. Integrating all the components of
Discrete
Components
the frequency-synthesis function into a
monolithic CMOS device allows the
designer to achieve greater control over
the power consumption of the entire
Boards and
chip are
shown at
79% of
actual size.
functional block with one control interface.
With active consumption of 18 mA from
a 3V supply, the Si4133 sets a new
standard in power efficiency.
DEVELOPMENT TOOLS
Top
Design engineers can order the Si4133-
Back
EVB which includes an evaluation
board that supports all derivative
The Si4133 dramatically reduces the number of components required to implement a
options for the Si4133 family of synthe-
complete dual-band RF frequency synthesizer function for wireless communications.
sizers. New user-friendly evaluation
This unprecedented level of integration can reduce board space by as much as 75%
software features a windowing interface
over traditional frequency synthesizer architectures using a dual-band frequency synthe-
for easy manipulation of the device
sizer IC, external VCOs, varactor diodes and up to 35 additional passive components.
from a standard PC. The development
Designers can realize cost reductions of 33% over traditional solutions by designing with
environment allows for straightforward
the Si4133. The robustness and consistency of an integrated solution improves ease of
assessment of the device’s performance
manufacture and lower test and assembly costs for high-volume wireless applications.
using industry-standard test and
measurement equipment.
ORDERING INFORMATION
CONTACT INFORMATION
Product
Description
Si4133-KT
RF1/RF2/IF Frequency Synthesizer, 24-pin TSSOP, 0 to 70° C
Si4133-BT
RF1/RF2/IF Frequency Synthesizer, 24-pin TSSOP, -40 to 85° C
Si4133HF
RF1 (2.4 GHz)/RF2 (1.7 GHz)/IF Frequency Synthesizer,
24-pin TSSOP
Silicon Laboratories, Inc.
4635 Boston Lane • Austin, TX 78735
Toll Free:1(877)444-3032
Email: productinfo@silabs.com
Web site: www.silabs.com
Silicon Laboratories, and the Silicon Laboratories’ logos
are trademarks of Silicon Laboratories, Inc.
PB:Si4133; KES-5,000-5/99-0
Si4133HF1
RF1 (2.4 GHz)/RF2/IF Frequency Synthesizer, 24-pin TSSOP
Si4123
RF1/IF Frequency Synthesizer, 24-pin TSSOP
Si4122
RF2/IF Frequency Synthesizer, 24-pin TSSOP
Si4113
RF-Only Synthesizer, 24-pin TSSOP
Si4112
IF-Only Synthesizer, 24-pin TSSOP
Si4133-EVB
Si4133 Evaluation Board supports all derivative products